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Here's a civil war backup story by Jeffrey Jones that I stumbled on, worth seeing.
At first glance, it looks like Chaykin to me, but it's Jeffrey Jones. And among his earliest work, if not his very first published story.

THE PHANTOM 25, Sept 1967
https://viewcomiconline.com/the-phantom-1966-issue-25/

The Phantom Stranger lead story is by artist Senio Pratesi, who I never heard of before, but I like the art.
And Jeffrey Jones did the 4-page "Fort Sumter" backup story.

Pretty cool, Jeff Jones' rendition of president Abraham Lincoln, and of the historic event that began the Civil War.